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Finding the Third Proportional to 858 and 2,315

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Solution

The third proportional to 858 and 2,315 is: 6,246.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    858 : 2,315 = 2,315 : x
  2. Step 2: Convert to fraction form
    858/2,315 = 2,315/x
  3. Step 3: Cross multiply
    858x = 2,315 × 2,315
  4. Step 4: Simplify right side
    858x = 5,359,225
  5. Step 5: Solve for x
    x = 5,359,225/858
  6. Step 6: Final answer
    x = 6,246.18

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Why These Related Problems?

These problems maintain the same ratio (2.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.